Lamp-mount for projectors.



T. I DUFFY.

AMP MOUNT FOR PROJECTOBS. APPLICATION FILED JUNE 19. I917- 1,3fiQ3fiQ. v Patented Apr. 15, 1919 Warren snares li i il ldil l l THOMAS I. DUFFY, OF OAK PAR-K, ILLl'NOIS, ASSIGNOE. T STEWARTJVARNER SPEEDOMETER, CORPORATION, OF CHICAGO, ILLINOIS, A CDRPOIM'KTIGH F vmerme.

LAMP-MOUNI F03, PRQJEGTOM.

Specification of Letters Patent.

Patented. 1.5, lllllil.

.mounting and adjusting an electric lamp bulb in relationto the focusing member,

such as the reflector, of a lantern of the projector type, as for example, a headlight or a search light. The invention consists of the features and elements described and shown in the drawings, as indicated by the claims.

In the drawings:

Figure 1 is a side elevation of a lantern body with certain interior parts shown in section to indicate details of construction of the damp mounting means.

Fig. 2 is a sectional view of the lamp mounting means taken axially with respect to the lamp and substantially at right angles to the section of Fig. 1, as indicated by line 22, on Fig. 1.

Fig. 3 is a detail section taken transaxially, as indicated at line 3-3, on Fig. 1.

Fig. 4: is a detail section taken as indicated at line 4-4 on Fig. 1.

Fig. 5 is a detail section of the switch lever.

Fig. 6 is a detail view partly in section and with parts broken away to show the mounting means for the reflector.

Fig. 7 is a developed section on an enlarged scale taken as indicated at line 7-'? on Fig. 6. l

, Fig. 8 is a side elevation of amodified form'of focusing means In the embodiment of this invention shown in the drawings, the lantern casing or body, 1, is provided with a fixedly mounted reflector, 2, which may be understood as a .focusing reflector, so that the incandescent filament, 3, of the lamp bulb, 4, is preferably in a form inwhich its luminous portion. is disposed as nearly as possible at a sin le point and in which this incandescent point or source of light should be substantially at the point in space which constitutes the focus of the reflector, 2. Since the filament of the lamp cannot be arranged with absolute accuracy with respect to the lamp bulb and base, 5, it is desirable to provide means for adjusting the lamp bodily with respect to the reflector, 2, so as to bring its incandescent filament, 3, to the focal point or the reflector.

To arrange for such adjustment, there is provided a mounting block, 6, preferably of nsulating material to which the reflector, 2, is secured by the engagement of three lugs, 7, of a mounting ring, 8, with securing screws, 9, in bosses, 10, of the block, 6. The material of the reflector, "2, immediately surrounding its central aperture, is crimped as indicated in Figs. .6 and. 7 to form teeth, ll against which the flange, 1.2, of the ring, 8, 1s firmly pressed, forming a permanent union between the reflector, 2, and the ring, 8.

The block, 6, is formed with a bore waxial with the central aperture of the relies tor, :2, and serving as a guide for a lamp carrier in the form of the cylindrical tube. 13, slidably mounted in said bore. The tube, 13, is secured against rotation in the bore of the block, 6, by its outwardly turned lug, 14, fitted in a' longitudiooal groove, 15, of the block, 6. The lamp base, 5, is secured in the tube, 13, by the usual bayonet loch, causing'the l.-sha'ped slots, 16, in diametri cally opposite bores of the tube wall for engaging radially extending pins, ii, on the lamp base, 5. L-slots, 16, are slightly ofiset to provide notches, 18, tending to lock the lamp base, 5, against rotation when the pins, 17, are engaged therein. The axial pressure required to maintain this engagement is sup' plied in the form of spring contact members 19 acting against the extreme inner end of the lamp base, 5, as indicated in Fig. 1.

The lamp carrier tube, 13, being axially slidable in the mounting block, 6, is rendered definitely adjust-able therein by means of a cam plate, 20, rotatably secured to the rear face of the block, 6, by means of two screws, 21, engaging segmental slots, 22, in said. plate, 20, together with a radially-extending tongue or lug, 23, near the rear end of the tube, 13, overlapping and engaging the cam face, 24, of the plate, 20. paid face, Q4, is in the form of a curved incline formed upon the plate, 20, at a portion immediatelyad- The terminal portions of the, 9G

' aoenti its'oentralaperture, and therefore mmediately adjacent the. portion of the tube, 13, extending through said aperture.

I "lug, 23,'is held in engagement with the cam face or incline, 24, by the spring pressure j notches, 18, to the tube, 13. Thus, while theseyielding conductor springs, 19, tend to force the lamp in one direction, that is, out

wardly with respect to the reflector, 2, said lamp may be withdrawn inthe oppositedi rection by partial rotation of the cam plate, 20,-and when the desired-locat on of the mcandescent filament, 3, is thus determined,

the parts may be secured in this adjusted p0 sition by tightening the heads of screws, 21,

I against the face of the plate, 20, adjacent the slots, 22. It will beseen that this in no way interferes with the removal and replacement of the. lamp, 4, but upon renewal of said lamp the focus may be readjusted if necessary. The spring conductor members, 19, aresecured to the mounting block, 6, by screws, 25, as shown in Fi 1, and one of the leadcwires,

I 26, is connect having a switch lever, 30, whose collar por- .to its corresponding conductor, 19, by securement under the head of one of the screws, 25. The otherlead wire, 27, "is attached by a binding screw, 28, to the spring contact arm, 29, of a switch device,

'tion, 31, encircles. the cylindrical body of the mounting block, 6, being retained thereon [by engagement of "certain portions in.

' grooves formed between the bosses, 10, of

'. the block, 6, and the forward face of the flange, 32, of said block, on whose rear face the focusing cam plate, 20, is mounted. The switch lever, 30, is mounted for limited rotation whose extent is determined bya slot, 33, in the lantern 'oasing,'1, through which the handle portion, 34, of the switch] lever projects. The contact'spring,29, be-v ing secured to the arm of the lever, 30, is

'bcntto extend transversely through an aper-. ture, 35, therein for contact; or its end or tion with a part o f'that' conductor spring, 19, to which nolead wire is connected, thus erving to complete the electric .ci'rcuit-Q When the switch lever, 30, is swung or rotated to n ove'its contact member, 29, away from the conductor 1 spring, 19, the end of said contact member, 29, drops into a notch,

:36, in the flange, 32, of the block, 6, thus preventing the switch lever from being jarred back into position for electrical'connection of the members, 19 and 29, but by virtue of the yielding nature of the contact 6 spring, 29, readily permitting said lever to be moved into such position if desired.

For purposes of-assembling the collar polltion, 31, of'the switch lever, 30, is formed with three notches, 37, extending radially from a. central aperture and designed to fit 1 over the boss'es,-10, on the mounting block, 6. The notches, 37 being registered with the 1 bosses, 10, the collar is slipped down against when the block, 6, is'mounted in'the casing,

1, whose slot, 33, limits the rotation of the switch .lever, 30, said lever is securely mounted on said block and cannot come out of the groove, in which it-rotatesl Similarly a. notch, 38, in the cam plate, 20, pennits litting it over the end of the tube, 13, without interference from the lug, 23; but when rotated to normal position of use and secured by the screws, 21, said notch, 38, of the plate, 20, will not again register with the lug, 23, and therefore will not permit disengage ment of the parts.

To prevent short-circuiting of the conductor springs, 19, by the metallic lamp-carrying tube, 13, the apertures, 39, in said tube throughwhich said conductor springs ex tend for contact with the rear end of the lamp base, 5, are made slightly wider than v said springs, and the springs themselves, are snugly housed in notches, 40, in thefiange,

tu re's, 39, to come into contact with the edges of the conductor springs, 19.1 It isfalso' desirable to provide clearance notches, 41,'in' I the central aperture of the switch lever ed1- lar,'to prevent contact of said collar with the secured portion of the conductorsprings,

19, which he in grooves 'or notches, in the cylindrical surface of the mounting block, 6.

ofthe s ucture in respectto the means for In Fig. 8 there is shown a' modification adjustin' l the lamp axially in its socket. In I this modification the insulating mounting block, 6, has its rear face formed withitwo cam slopes, 6, 6i, and'interven-ing "ab t shoulders, 6 Onthe rearwardly-protru .ing end portion of the sleeve, 13, which con stitutes the 1am socket, there is mounted an L a annular cam p ate, 50, having cam slopes" and shoulders'corresponding jethe slopes] and shoulders of the rear faceof the insu;

lating block, so that rotation of the cam plate on the block, ,6, causes the cam plate to be moved axially;. and the sleeve, 13, is provided at its rear end .outside the cam plate with an exteriorly-projecting flange,

6"," between which and t e cam faces of the insulating block, said cam'plate isretained.

It will beseen that the-rotation of the cam it, and its rotation in the opposite direction 1. In a light projector a focusing member; an incandescent lamp bulb, a guide fixed with respect to the focusing member, a lamp carrier mounted to move on said guide along theax'is of said focusing member, a yielding conductor engaging the base of the lamp in the carrier and arranged to force said lamp and carrier in one direction along said axis, and a cam device associated with the glide and adjustable for moving said carrier in the oppos' e direction.

2. In a light projector a focusing member, an incandescent lamp bulb, a mounting block fixed with respect to the focusing memher, a lamp carrier guided for movement through said block along the axis of the focusing member, a yielding conductor engaging the base of the lamp in the carrier and arranged to force said lamp and carrier in one direction along said axis, a cam plate rotatively mounted on the rear face of said block and means on the carrier en a ed b a h said plate for adjustment of said carrier in opposition to the yielding conductor.

8. The combination of a centrally apertured focusing reflector, a centrally bored mountingblock secured at the back of said reflector, a socket tube slidably carried in the bore of said block, a cam plate mounted for rotation on the rear face of the block, yielding means tending to force the socket in one direction, and means on the socket engaged by said cam plate for adjustment of said socket by rotation of said plate;

4. The combination of a focusing member, a socket member mounted for adjustment along the axis of said focusing member, a lamp carried in said socket member, the lamp base having a contact area on its end, a yielding conductor in contact with said area, and a cam engaging the socket member adapted to adjust and retain said member in opposition to the pressure of said yielding conductor.

5. The combination of a focusing member, a socket member mounted for adjustment. alongthe axis of said focusing member, a lamp carried in said socket member, the lamp base having a contact area on its end,

a yielding conductor in contact with saidarea, a cam plate mounted to rotate in a plane perpendicular to the axis of the focusing member and having a bearing face inclincd to said plane, and a follower on the ocket member engaging said bearing face of the cam.

b. The combination of a focusing mem a socket memhramounted for :aljustm along the axis of said focusiiig memb cam plat mounted to rotate in a plane pendicular to the axis of the focusing member having a bearing face inclined to said plane, a follower on the socket member engaging said bearing face, and yielding means for maintaining such engagement.

7. In combination with a focusi1'1g-membet, a socket tube and a mounting block in which said tube is guided for 'movement along the axis of the focusing member, a lamp in the tube having a contact area on the end of its base, the tube being laterally slotted, a yielding conductor finger extending through the slot of the tube in contact with the said area of the'lamp base and exerting a pressure thereon tending to move the tube one way through the mounting block, and means on the block for adjusting and retaining said tube in oppa- :ition to such pressure.

8. In combination with a reflector an insulating mounting block, a lamp socket in the form of a sleeve extending through said block and guided for longitudinal movement therein, said socket having means for engaging a lamp base therewith, the sleeve having an exteriorly projecting flange at its rear end, an annular member mounted on the sleeve and adapted to be rotated thereon,

having a cam slope seated upon a corresponding slope ofthe insulating block, said annular member being engaged under the flange of the sleeve for crowding said flange away from the said slope on the block when therein, said socket having means for engaging a lamp base therewith, the sleeve having an exteriorly projectmg flange. at its rear sleeve and adapted to be rotated thereon, having a cam slope seated upon a corresponding slope of the insulating block, said annular member being engaged under the flange of the sleeve for crowding the flange away from said slope on the block when the annular member is turned in one direction about the sleeve, and spring contact'fingers end, an annular member mounted on the i notches in the outline of said aperture spaced to register with the bosses of the mounting block for assembly thereon, said block having agroove between each boss and the aforesaid flange dimensioned to accommodate the thickness of the flat collar of the switch lever to permit rotation of the lever on the block and a casing having a segmental slot to receive the handle-of the lever and so limlting its rotation as to prevent the notche from registering with the bosses of the block when the parts are thus assembled.

r 11. In a light projector a reflector virith a central aperture to receive a lamp base, a

mounting block for such lamp "base, and means for attaching said block to they-re fiector comprising a collar with parts secured to the block-and a sleeve portion extendlng through the aperture of the reflector with flanges pressed against the opposite' In testimony whereofI have hereunto set 1 my hang this 29th day of May, 1917.

THOMAS I. DUFFY.-

at the periphery of its aperture being 

